How mining bitcoin is done with pen and paper (rare video)
In this article, the mining process is explained by a developer using cryptography with the help of a pen and paper. It shows how computer work, and makes it easy for us to understand the technical details behind cryptos, how safe the system is and how difficult it is to crack.
I would love to be able to mine crypto with pen&paper, but it's way too slow to be worth it :/